Many Cascade rivers are spring fed so some things will be running... but low. Here in So. Or. we occupy ourselves with 4 short runs on the NF Rogue (up to 4+, there is some class 5 on Mill Ck. release dates),the class 3 wild Rogue & Gold Ray run on the main Rogue, the class 4 dam controlled upper Klamath, or playing at Schoolhouse on the Middle Klamath. Low key but active boating community
The Gauley sounds like a darn good idea.